package filters;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import domain.User;


public class AuthenticationFilter implements Filter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse resp = (HttpServletResponse) response;
		
		try {
			
			HttpSession session = req.getSession();
			User user = (User) session.getAttribute("user");
			
			if (user == null) {
				resp.sendRedirect("../general/index");	
			} else {
				chain.doFilter(request, response);
			}
		} catch (Exception e) {
			resp.sendRedirect("../general/error");	
		}
	}

	@Override
	public void destroy() {
	}

}
